多个字符相加合成一个字符串

Question

请问将多个字符加到一个字符串里有好看点的写法吗？
就比如下面这种（我写的太丑了三种方法还都不对）

#include <iostream>
#include <string>

using namespace std;

int main()
{
    char a = 'a', b = '1', c  = '/';
    string s = "a1/bcd";

    string ans0 = s[0] + s[1] + s[2] ;

    string ans1 = to_string(a) + to_string(b) + to_string(c);

    string ans2;
    ans2 += to_string(s[0]) + to_string(s[1]) + to_string(s[2]);

    cout << ans0 <<" " <<ans1 << " " << ans2 << endl;
}

Answer 1

使用stringstream类

#include <iostream>
#include <sstream>
using namespace std;

int main() {
  char c1 = 'a';
  char c2 = 'b';
  char c3 = 'c';
  ostringstream oss;
  oss << c1 << c2 << c3;
  string s = oss.str();
  cout << s << endl;
  return 0;
}

2.使用字符串拼接方式

#include<iostream>
using namespace std;

int main() {
  char c1 = 'a';
  char c2 = 'b';
  char c3 = 'c';
  string s = "";
  s += c1;
  s += c2;
  s += c3;
  cout << s << endl;
  return 0;
}